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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5ed8c4ec094f8490e7d4494657f0fd7dd43ee0db2bea62431427d2e2bc82ab3' 
  AND token = 'G0pcES5K7GJEIjAgh8bmT2RA687goGnahzqhidgurPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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