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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3761f4f3a41fbe0bcf17ac987ff41b51182dc39446ac30872acf5c31d2707de0' 
  AND token = 'CISpvKPjQ2UekGnGXRNYpIqy4RtMxfA4Y4dSWBoT+OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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