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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c78ea3f452d8a88edef5801cead975beb787473067ed55affb776a429c3dbd2' 
  AND token = 'Vn8c8m3HfKN2SroHhxrRyii0QXPgbdn1sZRyyBFH+Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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