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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '359aa4907057877f772187aaadf439ebca67d9e0d8b2a494c7f5a992f2f0ccc1' 
  AND token = 'YgPsJ27SK8LlPilQf2zPkLylnJ81Iq0u7+ttatLoap8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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