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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86f18f840230e595eb90107d838c35faecf5f20b21e2947231926aced373076e' 
  AND token = 'qv63AiYbTwywtY/5o0ROINzfr4nkFCW2Ed+P/uba4oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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