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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49cbad3c192327b3572b8f6eb5158b923bf42a592a1d1abd6e8d4c2ae7a351dd' 
  AND token = 'vvJbPG8rn282P3elzXq3rx1t8aF6aSA0DPNpJWKVr6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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