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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abe7b3c8bcae178376df86f96ed3e8e9700487a7f1b305a61a584f6c371e8f8d' 
  AND token = 'bRclK91W0w0NuUSi1TAA+yUNmtgC1s/HsbaAIA/kW4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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