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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '465f36a27402ba4f505d0115fd3ca4de7d45bc5a2f963aca92493b2331e783db' 
  AND token = 'M917Rl5iiM2ETALLny81BKYB9QobH7k3Q38jEZtx0sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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