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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '494a2d557bcfcfd17d35449be6f65cd87650b30da7c43d3a74cfaf2dd8817dc3' 
  AND token = 'azSZj0IvmQ5Pi8c3PSQB3qt0bTa2PPPY+fy1wt2dUqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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