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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9f311c6ed10142e00c577763886d9c34e249ece90bc7edb504aee9b6bee1e6d' 
  AND token = 'Ir3/8WwVQ2rgkBCLt/ln6LLNGOSaqDg+Jv1Ls7/BR+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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