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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '875df28069af2d610683af475cd68a0661408e312d1364046e8f7db5955c5ce4' 
  AND token = 'LFIAWjoKYoAImHFGeQH8DhYNaHpnCrfvnKZ8k0Rxu70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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