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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8c22b3948363db77f24b3fd81a2ac1600db059552e564c5a0b8848d222b663d' 
  AND token = 'k/UYg1m8We4dpnolaqgycwXHgLs8okHnMvFTo42eyRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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