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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '637f790eae20c94a1d7ffc643878b801aed7ea410d32e641479260ff2c50d5ed' 
  AND token = '+R4mHWTBtUP/BHc2QI4hi7yLBgXMTZz9mtagf0NDlxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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