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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ea97624ae2edd9fc05f7a9af8dcda0b0930278a14458ca1f0f6247b866dd2f0' 
  AND token = 'XEZqPBNwn35comPlEAp2xqzWYSkFFpNdAld0urxxWjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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