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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0e3708130e1855ba1a2be3dfac9a7a3aaa1ece8d15d0b5b9aafdd95e1047566' 
  AND token = 'e1bfhhpqwQgNEC8wLYAaT+Hf4snTOpDElHbHGVVI85o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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