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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '809e18bae75b11d8d846f07e904e79c5f7cc4ebf94cd45470afcec0088bb4e7c' 
  AND token = 'EPEiGaALlSI9//8e5cNe+/nXgUNfJm5glh6u/q8dLng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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