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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9c32690e6914acb42270cef3901a34485209d1d08077f33e8b2a1bdb6b8b1f3' 
  AND token = 'yjkN0/EInEFnQVPrfpqpRJOSBC0yWLNPJDa/3nxeCIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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