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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee9ae3162924464b6fe797bf14773877d30eab1d34bb898a627c673815f9c8e2' 
  AND token = 'cNuiO2eLtFppqGHemQ38qGRbzxnoTwxuz2qKdTGNexU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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