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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e263f9ee225addaeac34559aa0e1da240a45e99bc0b94e2e2ad4fa8ea8327a4' 
  AND token = 'wEPc8A9MPlsMFN9Vnb+xQ5TfcjNapbTwY1UVq+mksqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}