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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92f7fcf4c8022878526a69cb62c703ce0c05d35efbb84e3f7f2adbac4cbdff4f' 
  AND token = 'dKR0f0rOoSP84KjK+H516tMi1ChUnUhwh5zNC/TThL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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