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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c90e4e616e26e501662351d6b584d9ff5532107811b2b69650feded80251884' 
  AND token = 'rhmwKaHs1hbhwTG/wr8GDYpfxAu0bZhJsZjbAa0a/kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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