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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60029f61326d1b81fd19422a1ac85ddc1d5870a7cc94eb7dc5b5787461885490' 
  AND token = 'oa5QhLa1/c2rwpiMsCXdfOZigXjN72khEv1zvPjdL6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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