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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '373e0026f74b4080a62a7708ad470cf85fe16b3c6b1899450a67c4a844920e1c' 
  AND token = 'Wz5zN+3RMpcS7mW1VcgJo4V16dIE5GqZUOGreKd/+yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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