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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1341d184db8a3267bdd332b55bbd23c4956f62e40bca77df22cffa2f127759b5' 
  AND token = 'uiy7gNRa5swzgt2pV7aI8jo2RI0YH79kbIvBo1DJKWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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