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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '354f683b8f64673c4b3c3c39023d13917e416e6a907cb42f7d6365d1e53ecf5c' 
  AND token = 'hSPj1tjE09zpm26L3hH/ddQpgvJj99LNAF6KSFDLp5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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