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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6206d9d5581b98a4a3777c9e340b425cbf6d278b0a67b5a2627ed8b5b8eb3bf5' 
  AND token = 'fI99CMnenWktouFe4CEXEqAwIXPq3BOSwG+I/apd/Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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