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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce7491186bb2426738206fa1ecdabc1b4b80aa6e6d8da5dc3db7d241ac034557' 
  AND token = 'OVBptxK0L0hIatslRS5tN1p6Deg9yk9h12EmWEk9GpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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