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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '507ebcbe106ab7010bfc2a654c6b52f882183e8c69457ecdff6bd26bd62769ee' 
  AND token = 'v2riBoPC5sftBEBlv18HFKJX2vUTv2U/nYEWDroNwfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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