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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63ec0ca74914868b8680ad9f20d671c76278f76b4e3bcde8c89a2ffccf6ac040' 
  AND token = 'uoFF8RO4xCrdpqvsiSjOWcsBGdOGlh4j+PatPp+zDOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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