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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e170cf657ca4a6f3f5a330b0574c0829ef632dc1c27b65e0db32e2f9f4eaa825' 
  AND token = 'TQftEex2PpmfLIncBYtp8fXto5QACOfOtXFSRiFkPHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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