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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feb6ef1643a459d024842d67e1557e510ee4904c05e7bbf9794a4db3e10c5c0a' 
  AND token = 'J2dufoyS+0jDS4eZ5DYcqzO7d2af2V9PSDbwzYSj1hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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