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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '388489b3149047dd49b03804cb54c9f9cc07769da18affaf541faf9403c3d526' 
  AND token = 'LO1KyvVvOKvXL8wSHKITTCQDHADXr5ZljMl5x1fOlj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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