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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaf11c11057e295276399bd609e672382729d03f1da9a51663c26c43e634c25c' 
  AND token = 'dcZv80M6llt45AsmjX1+NS3btU5aJAUVPhNkvEaepSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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