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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb1dc32e8374029dcffb79e3704167404b0275d1c8603db282b561e3c141d0a8' 
  AND token = 'kzM0xhA8L3d8kFteyw0urpE1D9vSMK/F75L38OlTCdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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