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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a334bbeb61a23e30e2fa8a98bfd2fefa17c7f8cffe2a245a879b05fb43cbc5e2' 
  AND token = 'pgxRFCAg/n3Nm6pExH7LZ/n7CBs6KyP267Kg2POz4xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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