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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90abcfe70d5bd0f1f87e173d08fba5db3c4c1ed31906bcaaddca4f38dffc2ca4' 
  AND token = 'gZ9dIa7stnJjm9eytoZBEaUQNGdxZ97ww+qp4PZZ1ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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