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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22fd7c4219a3adf3d6c060545a97d3b584a26d18793e4615bc841f2a0b738c2c' 
  AND token = 'WQOAQPOeRT6P4lnh3PbThuW06ltcxk/Idfsqai/2Ulc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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