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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a56aaac0ec4d66fbe07685fb9c6be160ebef25f4cc4b715a90fdc793e344bb7b' 
  AND token = 'V7+EId+hTFfH8tOm2KpWmlvrTK/H5NnPm8gNp3+IkO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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