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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '699a7339d11acc09d059435e3a3bd8eda73414ac7012df6a5f43e5401ec38a37' 
  AND token = 'SP47sg0jw8N3SZDbuMzcRgtOP8p07irboxwhosEoNYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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