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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19f0d4ac710cb3714d9b40e68c0111218990fe5a1db0757231724ae2604ed818' 
  AND token = 'B7VCirxcN5AiTP8+uUljP244DoUUE5HApkmN6mANrRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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