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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2604d16bdb8ee7126d4244282b54b3954baf922e38c659d0abfe79747ac86676' 
  AND token = 'GICuOjRGWWAcT7B0rz22uYgeOGu0yAxQ7byxuUHdDxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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