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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8ffdbd79e3eccd6de8179e199f92df81b436c1de1d769eb2a75a455b4f38a2c' 
  AND token = 'B58nm2n4ITOm4DELSsVnyS2PJuJ39UwG5ufiBFN3c/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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