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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bb5477656936692f33bc11e349c3cbc4c3b410e7ab0611e4543d38394f86095' 
  AND token = 'o2VPikj7QSVZveEbjGQP4c0M6vCJk5hDTFg1IY0O00k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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