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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '756789a47e4c0340d0efe370d7c8baa54b73e276210a564cd896afffbe888b06' 
  AND token = 'aEpa1itHtrZLWZ8iUkxIXWotf5oKVWgD3FyCxfq2/Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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