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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60f09140461f344d5af85e7560489a09e829fa03a41fe086e3f1ac963273758a' 
  AND token = 'xqEH/phK131Fb/38rhx+rdIdeMIuk5GBoL6sNKiCaos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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