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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d2691e0a41204553bd7477b1e96ffaab09bf1bb10d96500f55de43dba6abc58' 
  AND token = 's3YlbP5YQ6ieDj28Ovnn8h6K582lRQozxYho84wXzjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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