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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '686f6230ce2f23fa003a02997b3f21a264229aa0b6067ec9aff6a3d9ca6cb2ff' 
  AND token = 'x25unohMGaXRlVScT7X2aKE01hjD2tlXvnX4W9fX6oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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