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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd16be3ad8f5fe8b53975e1871115584f12da9ead4b676e8e4a34c6b9c1621709' 
  AND token = 'Osc4SQiB3Qhl4dh09ld7i0HXIjOsWJUtVNos01XiFCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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